JP2005131592A - Organic waste liquid treatment method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an organic waste liquid treatment method which enables stable operation, reduce the residual quantity after treatment, and reduce energy consumption. <P>SOLUTION: The organic waste liquid treatment method for mixing organic waste liquid and a conditioning material containing microorganisms for organic waste liquid fermentation and fermenting the mixture to reduce or eliminate organic substances in the organic waste liquid, comprises a first process for stirring the organic waste liquid and the conditioning material to obtain a fermenting mixed material, a second process for evaporating moisture from the fermenting mixed material by using its fermentation heat, and a third process for repeatedly feeding the fermenting mixed material subjected to the second process as the conditioning material for the first process. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a method for treating an organic waste liquid suitable as a technique for treating an organic waste liquid containing a large amount of water such as shochu.

  Among organic waste liquids, a methane fermentation method, a combustion method, a dumping method, and the like have been widely known as methods for treating organic waste liquids containing a large amount of water, such as shochu.

  The methane fermentation method is a method of decomposing a mixed gas of methane and carbon dioxide gas while drying surplus sludge generated separately to produce feed and fertilizer. The combustion method is a method of burning shochu by applying heat. The dumping method is a so-called ocean dumping method.

  However, in the case of the methane fermentation method, it is relatively difficult to process stably, and the supply destination of the finished feed and fertilizer is limited, so that there is a problem that new waste is generated.

  In addition, since shochu contains about 95% of water, a large amount of energy is required to evaporate the water. In addition, there is a problem that the furnace deteriorates quickly and lacks durability. In this respect, the combustion method is not preferable.

  Further, the method of ocean dumping has a problem that it is not possible to dump the ocean in the future due to the industrial waste ocean dumping prohibition law because it pollutes the sea.

  Accordingly, an object of the present invention is to provide an organic waste liquid treatment method capable of performing stable treatment, generating no new waste, and reducing energy consumption.

In order to solve the above problems, the present invention employs the following method.
That is, the present invention is an organic waste liquid treatment method for reducing or eliminating organic matter in an organic waste liquid by mixing and fermenting an organic waste liquid and a regulator containing a fermentation microorganism of the organic waste liquid,
A first step of stirring the organic waste liquid and the adjusting material to obtain a fermented mixed material;
A second step of evaporating moisture from the fermentation mixture using the fermentation heat;
And a third step of repeatedly supplying the fermented mixed material after the second step as the adjustment material of the first step.

  According to the present invention, since the organic waste liquid is fermented with microorganisms, no special treatment is required after mixing the organic waste liquid and the adjusting material, and stable treatment can be performed. In addition, by stirring the organic waste liquid and the adjusting material in the first step, it is possible to create an environment suitable for fermentation (constant water content and moderately ensured air permeability). Further, in the second step, moisture can be evaporated using this heat during a period in which fermentation heat is generated. Thereby, the supply of artificial heat can be unnecessary or reduced, and the material after fermentation can be repeatedly used as an adjustment material. Furthermore, in the 3rd process, it can be set as the processing method by which a residue does not generate | occur | produce for every process in principle by supplying the fermented mixed material after a 2nd process as an adjustment material of a 1st process.

  In the present invention, in the first step, the organic waste liquid and the adjustment material are stirred using a mixing and processing machine capable of pulverizing and mixing, and in the second step, the fermentation mixture obtained in the first step is stored. It is desirable to use a fermentation tank that is fermented for a predetermined period. When such a mixed processing machine is used, even if a lump is generated in the fermentation process, the lump can be pulverized by passing through the processing machine to promote the fermentation. Moreover, the processing tank suitable for promoting fermentation can be employ | adopted by using a fermentation processing tank.

  In the third step, after the fermented mixed material obtained in the first step is conveyed to the fermentation yard and fermented for a predetermined period in the second step, the fermented mixed material is repeatedly used as the adjusting material in the first step. A supplying method can also be adopted. In this method, a large-scale fermentation treatment facility is configured at a low cost, and is in a form suitable for a large amount of fermentation treatment.

  In the present invention, when the organic waste liquid is shochu, it is desirable to use compost containing a solid content such as a woody material as the adjustment material used first in the first step. When compost is used as the initial adjustment material to be supplied, the compost is easily obtained and fermented with microorganisms existing in nature, so that more stable treatment can be performed. In that case, decomposable substances such as protein and fat in the solid content in the shochu can be decomposed as ammonia, carbon dioxide gas and water vapor.

  ADVANTAGE OF THE INVENTION According to this invention, the organic waste liquid processing method which can perform the stable process, can reduce the residue after a process, and can also reduce energy consumption can be provided.

(First embodiment)
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described with reference to the drawings.
FIG. 1 is an overall configuration diagram of an apparatus suitable for realizing the organic waste liquid treatment method according to the present invention. FIG. 2A shows a horizontal sectional view of the fermentation treatment tank, and FIG. 2B shows an enlarged view of a portion B. FIG. 3 is a longitudinal sectional view taken along line AA in FIG. In addition, in these figures, it has illustrated as an apparatus suitable when an organic waste liquid is shochu.

  First, the organic waste liquid treatment apparatus shown in these drawings will be described. As shown in FIG. 1, this organic waste liquid treatment apparatus is necessary for a shochu tank 1, a conditioning material hopper 2, a mixing treatment machine 3, a vertical treatment tank (fermentation treatment tank) 4, and a mutual one. And various conveying means.

  The shochu tank 1 is a tank that stores shochu as an organic waste liquid to be treated, and includes a transport means 13 to the mixing processor 3. The conveying means 13 is composed of a supply pipe 11 and a pump 12.

  The adjusting material hopper 2 is a hopper for storing an adjusting material containing microorganisms for fermentation of shochu. The adjusting material hopper 2 includes a belt conveyor 21 as a conveying means to the mixing processor 3. The adjusting material hopper 2 includes adjusting material measuring means (not shown) for discharging the adjusting material to the belt conveyor 21.

  The mixing treatment machine 3 is for obtaining a fermented mixed material by pulverizing and stirring the organic waste liquid and the adjusting material, and is equipped with blades (not shown) effective for pulverizing, stirring and mixing. . This mixing processor 3 is a vertical type, and an upper portion thereof is provided with an inlet 31 for processed products (shochu and adjusting material), and a lower portion thereof is provided with an outlet 32 to the fermentation treatment tank 4.

The fermentation tank 4 mainly stores the fermentation mixture obtained by the mixing processor 3 for a necessary period of time and ferments it, while using the fermentation heat to partially or entirely remove moisture from the fermentation mixture. It is a processing tank for evaporating, and is disposed directly under the mixing processor 3.

  The upper part of the fermentation treatment tank 4 is opened and formed as a receiving port 41 for the fermented mixed material falling by its own weight from the discharge port 32 of the mixing processor 3. At the bottom of the fermentation treatment tank 4, a fermentation mixture discharge port 42 is provided.

  In order to convey a part or all of the fermentation mixed material discharged from the discharge port 42 of the fermentation treatment tank 4 to the adjustment material hopper 2 and the mixing processor 3 between the fermentation treatment tank 4 and the adjustment material hopper 2. The vertical belt conveyor 43 is arranged. That is, the vertical belt conveyor 43 includes a supply path 45 to the adjustment material hopper 2 and a supply path 46 to the mixing processor 3.

  Note that. In FIG. 1, a drying device 50 is disposed immediately below the discharge port 42 of the fermentation treatment tank 4. The drying device 50 is a device that can heat and dry the fermented mixed material discharged from the discharge port 43 as necessary, or allow it to pass through as it is. The drying device 50 is installed as necessary.

  The shochu tank 1 and the adjustment material hopper 2, the mixing processor 3, and the fermentation tank 4 are arranged up and down so as to efficiently carry out self-weight conveyance and continuous processing effective in terms of energy saving.

  A specific configuration of the fermentation tank 4 is illustrated in FIGS. 2 and 3. The fermentation treatment tank 4 is disposed in the treatment tank main body 5 containing the fermentation mixed material therein, and in the treatment tank main body 5, and aeration that exerts a function of supplying outside air to the fermentation mixed material in the treatment tank main body 5. Means 6 and a venting and exhausting means 7 provided in the processing tank main body 5 and exhibiting the function of venting the fermentation mixture and guiding the moisture in the processing tank main body 5 to the outside.

  The processing tank main body 5 includes an inner tank 8 and an outer tank 9. The inner tank 8 has a cylindrical shape and the inside of the peripheral wall itself is formed hollow. The inner tank 8 has, for example, a double tube structure including an inner cylinder 8a and an outer cylinder 8b, and an exhaust passage 8c is formed inside. As shown in FIGS. 2 and 3, the inner cylinder 8a and the outer cylinder 8b are provided with a plurality of openings 8d and 8e communicating with the exhaust passage 8c from the inner tank 8 and the outer tank 9, respectively. The exhaust passage 8c and the plurality of openings 8d and 8e constitute an exhaust means (inner tank side exhaust means) 7 that also serves as a ventilation. Although only a part of the openings 8d and 8e are shown in the drawing, a large number of openings 8d and 8e are provided at intervals in the circumferential direction and the height direction of the inner tank 8.

  The outer tub 9 has a cylindrical body portion and a lower hopper shape, and the inside of the peripheral wall itself is hollow. The outer tub 9 also has a double pipe structure including an inner cylinder 9a and an outer cylinder 9b, for example, and an exhaust passage 9c is formed therein. The inner cylinder 9a is provided with a plurality of openings 9d communicating with the exhaust passage 9c from the outer tank 9. The exhaust passage 9c and the plurality of openings 9d constitute an exhaust means (outer tank side exhaust means) 7 that also serves as a ventilation. A large number of the openings 9d are also provided at intervals in the circumferential direction and the height direction of the outer tub 9.

  In this example, the dimensions of the body portion of the outer tub 9 are a height H = 1.5 m, a diameter D = 3.0 m, and the inner tub 8 has a diameter of 1.5 m. Of course, this dimension is an example, and the size can be arbitrarily selected. The openings 8d, 8e, and 9d have a diameter of about 5 mm and an opening ratio of about 20%.

As the ventilation means 6 and the exhaust means 7, forced air supply and forced exhaust using a fan or the like are possible, but from the viewpoint of energy saving, a method using natural ventilation by convection or the like is adopted. The aeration means 6 in the illustrated example has a plurality of ventilating horizontal pipes (horizontal portions) extending in the horizontal direction in the processing tank main body 5 in a plurality of stages (shown as four stages for easy understanding of the drawing). It is comprised by the hole tube (1st hole tube 4a, 2nd hole tube 4b, 3rd hole tube 4d).

  The first perforated pipe 4 a is formed in a ring shape along the inner peripheral surface of the inner tank 8, and the second perforated pipe 4 b is formed in a ring shape along the outer peripheral surface of the inner tank 8. The three perforated pipes 4d are linearly formed in such a manner that the first perforated pipe 4a and the second perforated pipe 4b are connected (communicated) with each other. Is arranged. Four third perforated tubes 4d in each stage are used, and they are arranged in a plane cross shape. The end of the third perforated pipe 4d penetrates the outer tub 9 and communicates with the outside air.

  Although not shown in particular, all of the perforated pipes are filled with a heat insulating material. The cross-sectional area of this heat insulating material is formed smaller than the cross-sectional area of the perforated pipe. The reason for providing such a heat insulating material is to exhibit the following effects. This is because the air inside the perforated tube is easily warmed by making the volume (effective cross-sectional area) inside the perforated tube smaller than the surface area of the perforated tube. This is because convection can be effectively performed. However, if the internal volume is too small, the amount of air as a whole decreases. Therefore, the size of the heat insulating material is determined in consideration of these points.

  Here, the perforated pipe refers to a so-called perforated pipe in which a large number of holes communicating inside and outside are provided on the surface thereof.

  Next, an organic waste liquid treatment method (operation example) using the apparatus having such a configuration will be described below. When the organic waste liquid is shochu, for example, compost containing a solid content is used as an adjustment material that is first supplied to the mixing processor 3. This is because when compost is used as the adjustment material to be supplied first, compost is easy to obtain, and because the shochu is fermented with microorganisms existing in nature, a more stable treatment can be performed.

  As a preferable mode of operation, shochu to be processed is stored in the shochu tank 1, and a necessary amount of compost is stored in the adjusting material hopper 2. Then, the pump 12 and the belt conveyor 21 are operated to continuously supply shochu and compost to the mixing processor 3.

  The supplied shochu and compost are continuously pulverized and agitated by the mixing processor 3 and mixed uniformly, supplied as a fermented mixed material to the fermented fermenter 4 by falling under its own weight, and stored in the fermenter tank 4. (First step).

  Oxygen is supplied to the fermentation mixture stored in the fermentation tank 4 by the perforated pipes (the first perforated pipe 4a to the third perforated pipe 4d) constituting the aeration means 6 and the aeration / exhaust means 7. And fermentation is promoted.

  When the fermentation of shochu is promoted, the temperature in the fermentation treatment tank 4 rises to a predetermined temperature (about 60 ° C. or more) after about one day. In the process, degradable substances such as protein and fat in the solid content in the shochu are decomposed as ammonia, carbon dioxide, and water vapor. When the temperature in the tank reaches 60 ° C. or higher, water vapor is released from the exhausting means 7 which is also used for ventilation. (Second step)

  In other words, shochu is an acidic organic waste containing alcohol and organic acids generated after distillation of the fermentation broth, but by mixing this with a conditioning material and fermenting it, the solid content in the shochu is gas ( (Ammonia, oxygen gas, etc.) and discharged with water vapor for treatment.

When the temperature in the fermentation treatment tank 4 reaches a predetermined temperature (about 60 ° C. or higher), the fermented mixed material (processed product) is taken out from the tank (discharged from the discharge port 42), and if necessary. Then, after drying with the drying device 50, it is sent to the adjusting material hopper 2 through the supply path 45 of the vertical belt conveyor 43 (third step).

  The weight of the processed product sent to the adjustment material hopper 2 by the vertical belt conveyor 43 is measured here, and the weight of the amount discharged as water vapor is obtained. And after the shochu equivalent to this weight and the processed material in the adjustment material hopper 2 are uniformly mixed by the mixing processor 3, it is thrown into the fermentation processing tank 4 (4th process).

  Thereafter, the same processing may be repeatedly performed. However, it is not necessary to return all the adjusting materials after the fourth step to the adjusting material hopper 2 and to measure them. In the second step, the weight released as water vapor can be determined per unit weight, and thereafter, the adjusting material may be directly supplied to the mixing processor 3 using the supply path 46.

  A preferable operation method as this repetitive processing is a mode in which the processed product fermented in the fermenter 4 is supplied directly to the mixing processor 3 via the supply path 46 after the fourth step (fifth step). In the case of shochu, the repeated treatment period in the fifth step is 2 to 8 days, assuming that the third step is one day. Therefore, in this repetitive processing method, the cycle is eight days.

  According to experiments, fermentation heat was generated about one week after the treatment. During this time, the solid content in the shochu was almost decomposed, and about half of the water was evaporated. The same process could be repeated by adding shochu to the fermented material.

According to this embodiment, the following effects can be obtained.
・ Since shochu is fermented with microorganisms that exist in nature, no special treatment is required after mixing shochu and conditioning materials, and stable operation is possible.
-By stirring and mixing the shochu and the adjusting material with the mixing processor 3, it is possible to create an environment suitable for fermentation (constant water content and adequately ensured air permeability).
-Even if a lump is generated in the fermentation process, the lump can be crushed and the fermentation can be promoted by passing through the mixing processor 3.
-In a 3rd process, it can be set as the processing method which does not generate | occur | produce a residue for every process in principle by supplying repeatedly the fermentation mixed material after a 2nd process as an adjustment material of a 1st process.
・ Since there is no residue, there is no waste disposal cost.
-Repeatedly used adjustment material can be used as high-quality compost.
-By using the heat of fermentation to evaporate water, artificial heat supply can be reduced or eliminated.
・ Operation costs and environmental impact can be reduced.

(Second Embodiment)
In the first embodiment, an example using the fermented soybean cake 4 has been shown, but the following method can be adopted instead of the method using the fermented rice cake 4.

  That is, in the second step, after the fermented mixed material obtained in the first step is conveyed to the fermentation yard and fermented for a predetermined period, the fermented mixed material is repeatedly supplied as the adjusting material in the first step. is there. An example is shown below.

-The adjustment material is taken out from the fermentation yard with a wheel loader or the like, put into the adjustment material hopper 2, and supplied to the mixing processor 3 by the belt conveyor 21.
-Supply the adjustment material and shochu to the mixing processor 3.
・ Mix, pulverize, and agitate them in the mixing processor 3 to create an environment suitable for fermentation.
・ Receive the processed material with a dump truck and deposit it in the fermentation yard.
・ By fermentation in the fermentation yard, the solid content in the shochu liquor is decomposed and the water is evaporated to about half.
-Use the material after this fermentation again as an adjustment material, and supply the shochu liquor corresponding to moisture reduction.
-The steps (1) to (6) are repeated.

    In this embodiment, since a fermentation yard is used, it is suitable for carrying out a large amount of fermentation treatment.

  In the above embodiment, the case where the organic waste liquid is shochu has been described as an example, but the present invention can also be applied as a processing apparatus for organic waste liquid other than shochu.

It is a whole block diagram of an apparatus suitable when enforcing the organic waste liquid processing method concerning this invention. The fermentation processing tank of the apparatus which concerns on this invention is shown, (a) is a horizontal sectional view, (b) is an enlarged view of the part enclosed with B. It is sectional drawing along the AA line of Fig.2 (a).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Shochu tank 11 Pipe 12 Pump 13 Conveying means 2 Adjustment material hopper 3 Mixing processing machine 31 Input port 32 Discharge port 4 Fermentation processing tank 41 Receiving port 42 Discharge port 45, 46 Supply path 4a 1st perforated pipe | tube 4b 2nd existence Hole tube 4d Third perforated tube 45 Supply path 46 Supply path 5 Processing tank body 50 Drying device 6 Ventilation means 7 Ventilation exhaust means 8 Inner tank 8a, 9a Inner cylinder 8b, 9b Outer cylinder 8c, 9c Exhaust passage 8d, 8e, 9d Opening 9 Outer tank

Claims (4)

An organic waste liquid treatment method for reducing or eliminating organic matter in an organic waste liquid by mixing and fermenting an organic waste liquid and a conditioning material containing a fermentation microorganism of the organic waste liquid,
A first step of stirring the organic waste liquid and the adjusting material to obtain a fermented mixed material;
A second step of evaporating moisture from the fermentation mixture using the fermentation heat;
A third step of repeatedly supplying the fermented mixed material after the second step as the adjusting material of the first step.   In the first step, the organic waste liquid and the adjusting material are stirred using a mixing processor capable of pulverizing and mixing, and in the second step, the fermentation mixture obtained in the first step is stored and fermented for a predetermined period. The organic waste liquid treatment method according to claim 1, wherein a fermentation tank is used.   In the second step, the fermented mixed material obtained in the first step is conveyed to the fermentation yard and fermented for a predetermined period, and then the fermented mixed material is repeatedly supplied as the adjusting material in the first step. The organic waste liquid treatment method according to claim 1, wherein   The organic waste liquid treatment method according to claim 1 or 2, wherein the organic waste liquid is shochu, and the adjustment material used first in the first step is compost containing solids such as a wooden material.

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